Received-SPF: pass (google.com: domain of linux-kernel+bounces-36906-linux.lists.archive=gmail.com@vger.kernel.org designates 2604:1380:45d1:ec00::1 as permitted sender) client-ip=2604:1380:45d1:ec00::1;
From: Shradha Todi <shradha.t@samsung.com>
To: linux-clk@vger.kernel.org, linux-kernel@vger.kernel.org,
	linux-pci@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
	linux-samsung-soc@vger.kernel.org
Cc: mturquette@baylibre.com, sboyd@kernel.org, jingoohan1@gmail.com,
	lpieralisi@kernel.org, kw@linux.com, robh@kernel.org, bhelgaas@google.com,
	krzysztof.kozlowski@linaro.org, alim.akhtar@samsung.com,
	linux@armlinux.org.uk, m.szyprowski@samsung.com,
	manivannan.sadhasivam@linaro.org, pankaj.dubey@samsung.com, Shradha Todi
	<shradha.t@samsung.com>
Subject: [PATCH v4 1/2] clk: Provide managed helper to get and enable bulk
 clocks
Date: Wed, 24 Jan 2024 16:08:37 +0530
Message-Id: <20240124103838.32478-2-shradha.t@samsung.com>
In-Reply-To: <20240124103838.32478-1-shradha.t@samsung.com>
Content-Type: text/plain; charset="utf-8"
CMS-TYPE: 105P
DLP-Filter: Pass
References: <20240124103838.32478-1-shradha.t@samsung.com>
	<CGME20240124103855epcas5p27400bd95df42f36b9547a4e28aa26f5d@epcas5p2.samsung.com>
Precedence: bulk

Provide a managed devm_clk_bulk* wrapper to get and enable all
bulk clocks in order to simplify drivers that keeps all clocks
enabled for the time of driver operation.

Suggested-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Shradha Todi <shradha.t@samsung.com>
---
 drivers/clk/clk-devres.c | 40 ++++++++++++++++++++++++++++++++++++++++
 include/linux/clk.h      | 24 ++++++++++++++++++++++++
 2 files changed, 64 insertions(+)

diff --git a/drivers/clk/clk-devres.c b/drivers/clk/clk-devres.c
index 4fb4fd4b06bd..cbbd2cc339c3 100644
--- a/drivers/clk/clk-devres.c
+++ b/drivers/clk/clk-devres.c
@@ -182,6 +182,46 @@ int __must_check devm_clk_bulk_get_all(struct device *dev,
 }
 EXPORT_SYMBOL_GPL(devm_clk_bulk_get_all);
 
+static void devm_clk_bulk_release_all_enable(struct device *dev, void *res)
+{
+	struct clk_bulk_devres *devres = res;
+
+	clk_bulk_disable_unprepare(devres->num_clks, devres->clks);
+	clk_bulk_put_all(devres->num_clks, devres->clks);
+}
+
+int __must_check devm_clk_bulk_get_all_enable(struct device *dev,
+					      struct clk_bulk_data **clks)
+{
+	struct clk_bulk_devres *devres;
+	int ret;
+
+	devres = devres_alloc(devm_clk_bulk_release_all_enable,
+			      sizeof(*devres), GFP_KERNEL);
+	if (!devres)
+		return -ENOMEM;
+
+	ret = clk_bulk_get_all(dev, &devres->clks);
+	if (ret > 0) {
+		*clks = devres->clks;
+		devres->num_clks = ret;
+	} else {
+		devres_free(devres);
+		return ret;
+	}
+
+	ret = clk_bulk_prepare_enable(devres->num_clks, *clks);
+	if (!ret) {
+		devres_add(dev, devres);
+	} else {
+		clk_bulk_put_all(devres->num_clks, devres->clks);
+		devres_free(devres);
+	}
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(devm_clk_bulk_get_all_enable);
+
 static int devm_clk_match(struct device *dev, void *res, void *data)
 {
 	struct clk **c = res;
diff --git a/include/linux/clk.h b/include/linux/clk.h
index 1ef013324237..a005e709b7bd 100644
--- a/include/linux/clk.h
+++ b/include/linux/clk.h
@@ -438,6 +438,23 @@ int __must_check devm_clk_bulk_get_optional(struct device *dev, int num_clks,
 int __must_check devm_clk_bulk_get_all(struct device *dev,
 				       struct clk_bulk_data **clks);
 
+/**
+ * devm_clk_bulk_get_all_enable - managed get multiple clk consumers and
+ *				  enable all clks
+ * @dev: device for clock "consumer"
+ * @clks: pointer to the clk_bulk_data table of consumer
+ *
+ * Returns success (0) or negative errno.
+ *
+ * This helper function allows drivers to get several clk
+ * consumers and enable all of them in one operation with management.
+ * The clks will automatically be disabled and freed when the device
+ * is unbound.
+ */
+
+int __must_check devm_clk_bulk_get_all_enable(struct device *dev,
+					      struct clk_bulk_data **clks);
+
 /**
  * devm_clk_get - lookup and obtain a managed reference to a clock producer.
  * @dev: device for clock "consumer"
@@ -960,6 +977,13 @@ static inline int __must_check devm_clk_bulk_get_all(struct device *dev,
 	return 0;
 }
 
+static inline int __must_check devm_clk_bulk_get_all_enable(struct device *dev,
+						struct clk_bulk_data **clks)
+{
+
+	return 0;
+}
+
 static inline struct clk *devm_get_clk_from_child(struct device *dev,
 				struct device_node *np, const char *con_id)
 {
-- 
2.17.1